[Keyboard] Add keyboard reviung53 (#15390)

* add keyboards/reviung53/

* modified:   keyboards/reviung53/rules.mk

* modified:   keyboards/reviung53/keymaps/default/keymap.c, keyboards/reviung53/keymaps/via/keymap.c

* modified:   keyboards/reviung53/readme.md

* modified:   keyboards/reviung53/config.h

1 files changed, 27 insertions, 0 deletions

diff --git a/keyboards/reviung53/readme.md b/keyboards/reviung53/readme.md
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+# reviung53
+
+![reviung53](https://github.com/gtips/reviung/blob/master/reviung53/image/reviung53-04.jpg) 
+
+The REVIUNG53 is 53-key keyboard.
+
+* Keyboard Maintainer: [gtips](https://github.com/gtips)
+* Hardware Supported: REVIUNG53 PCB. 
+* Hardware Availability: [PCB & Case Data](https://github.com/gtips/reviung/tree/master/reviung53) 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make reviung53:default
+
+Flashing example for this keyboard:
+
+    make reviung53:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available